Siemens 5ST3010-0HG Circuit Switch

Siemens 5ST3010-0HG is an auxiliary circuit switch (Hilfsschalter) designed as a mountable accessory for miniature circuit breakers (UL 489) in the SENTRON family. It provides a single normally open (NO) and a single normally closed (NC) contact, enabling status signaling without interrupting the main breaker circuit. The device is rated for insulation voltage up to 440 V and supports conductor cross sections from 0.5 mm² up to 2.5 mm² (AWG 24–12); electrical endurance is typically 6,000 operating cycles. Compatible with Siemens 5ST-series miniature circuit breakers and UL 489-compliant installations, this auxiliary switch is intended to be mounted on the breaker to furnish auxiliary signaling for control circuits and indicators.